645739202 has 8 divisors (see below), whose sum is σ = 968716812. Its totient is φ = 322833600.

The previous prime is 645739189. The next prime is 645739219. The reversal of 645739202 is 202937546.

645739202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 642673201 + 3066001 = 25351^2 + 1751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24302 + ... + 43382.

Almost surely, 2^645739202 is an apocalyptic number.

645739202 is a deficient number, since it is larger than the sum of its proper divisors (322977610).

645739202 is a wasteful number, since it uses less digits than its factorization.

645739202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36004.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 645739202 is about 25411.3990563290. The cubic root of 645739202 is about 864.3422007322.

The spelling of 645739202 in words is "six hundred forty-five million, seven hundred thirty-nine thousand, two hundred two".